{"product_id":"samsung-sgh-n500-replacement-battery-37v-850mah-li-ion","title":"Samsung SGH-N500 Replacement Battery 3.7V 850mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung SGH-N500 \/ SGH-N508 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 850mAh (3.15Wh) Li-ion cell for the Samsung SGH-N500 and SGH-N508 mobile phones. Both handsets use the same battery bay, connector, and charge IC, so a single cell covers both models. Fit this when the original cell no longer holds a usable charge through a normal day of calls and messaging.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSGH-N500 and SGH-N508 compatibility:\u003c\/strong\u003e\n    Both models share an identical battery bay geometry, three-pin connector layout, and charge IC communication protocol. The same cell works in either handset without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the SGH-N500 platform. The BMS accepted the charge handshake on the first cycle, and the protection circuit tripped correctly at the low-voltage cutoff threshold — no runaway, no false cutoff above 3.0V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, run one full discharge to auto-shutoff followed by a complete uninterrupted charge to 100% before using the phone normally. The SGH-N500's fuel gauge IC maps its percentage table against that first full cycle — skipping it causes erratic percentage readings from day one.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SGH-N500 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SGH-N500 uses a coulomb-counting fuel gauge IC that stores a discharge curve calibrated to the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-versus-capacity relationship of the replacement. The gauge reads voltage and translates it using the old map, so it can show 40% when the cell is nearly empty. One complete discharge-to-shutoff and full recharge resets the coulomb counter baseline against the new cell's actual curve. After that cycle, percentage readouts stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under the load spike from the GSM transmitter firing at full power during a call. The fuel gauge shows 25% remaining, but the cell's actual terminal voltage collapses below the 3.0V protection threshold under that burst current, and the BMS cuts the output. It is a voltage-sag issue, not a capacity issue. Let the phone complete the first full calibration cycle described above — if shutdowns persist after that, confirm the battery contacts are clean and making firm contact, as high contact resistance amplifies voltage sag.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409455579226,"sku":"BWCS-SMN500SL-1","price":21.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409455611994,"sku":"BWCS-SMN500SL-2","price":24.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409455644762,"sku":"BWCS-SMN500SL-3","price":26.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMN500SL-big.webp?v=1779579736","url":"https:\/\/batteryweb.com\/products\/samsung-sgh-n500-replacement-battery-37v-850mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}